Context Effects and Lexical Ambiguity Processing: an Activation-Based Account Frazier Orgain

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Context Effects and Lexical Ambiguity Processing: an Activation-Based Account Frazier Orgain University of Richmond UR Scholarship Repository Master's Theses Student Research 5-2002 Context effects and lexical ambiguity processing: an activation-based account Frazier Orgain Follow this and additional works at: http://scholarship.richmond.edu/masters-theses Recommended Citation Orgain, Frazier, "Context effects and lexical ambiguity processing: an activation-based account" (2002). Master's Theses. Paper 810. This Thesis is brought to you for free and open access by the Student Research at UR Scholarship Repository. It has been accepted for inclusion in Master's Theses by an authorized administrator of UR Scholarship Repository. For more information, please contact [email protected]. Project Name: ~~\V\,__ f yo..,:t;t/( Z,OO "Z- Date: Patron: Specialist: ~/l'l//S \)\ \) ~iL Project Description: N~tt,r Tke!~ Hardware Specs: CONTEXT EFFECTS AND LEXICAL AMBIGUITY PROCESSING: AN ACTIVATION-BASED ACCOUNT By Frazer Orgain B.S., Virginia Military Institute, 1999 A Thesis Submitted to the Graduate Faculty of the University of Richmond in Candidacy for the degree of MASTER OF ARTS m Psychology May, 2002 University of Richmond, Virginia I certify that I have read this thesis and find that, in scope and quality, it satisfies the requirements for the degree of Master of Arts. Ping Li, Thesis Advisor Jane M.~ ~ &wi Beth Crawford · 11 Abstract Many studies have been conducted to test the effects of ambiguous words in sentence processing. There are two views: the modularity hypothesis and the interactive hypothesis that dominate this field of study. The effect of ambiguity has been tested in many ways, including gating, cross-modal priming, naming, and self-paced reading. This study utilizes the methods of self-paced reading with lexical decision and naming tasks to examine the hypotheses as they relate to the access period of lexical differentiation. Results indicate that context has an immediate effect, after which participants look to other factors to discern meaning of a sentence. Details are discussed according to a time course activation model. 111 Acknowledgements I would like to thank Ping Li for the idea and support for this project. Before matriculation into the University of Richmond Cognitive Science Lab I had no idea that this was a research issue. Thank you for broadening my horizons and turning me into a research. A special thanks goes to Lucy Medina and Kathy Reid for the collection of data. We suffered through the Beta version of E-prime and from the meager beginnings to the culmination of data collection. And finally to my family. Mom and Dad, you have served as a cheering section for over a quarter century. This degree shines as proof of your undying support and everlasting love. And Corbin, you are the vessel from which I float. You bring me forth in effortless grace so that I may achieve great accomplishments. Without your steadfast support and unconditional love I could not find my way in the waters that seek to drown those unsure in direction. You have shown me the beacon for which to aim. I love you. lV Context Effects 1 Context Effects and Lexical Ambiguity Processing: An Activation-based Account Natural language provides many examples of ambiguity that we must discern for effective communication. A single sequence of words may render many interpretations. However, many of these situations often go unnoticed to a reader as it is assumed that context allows them to select among the various possibilities. One major research debate in language concerns whether the access and selection of a contextually appropriate meaning from among several possible definitions depends on the prior sentence context. Meaning also depends on how early the context can influence the access, selection, and integration processes. The study of lexical ambiguity affords the unique opportunity to examine the comprehension of words that have multiple meanings. It is a research area that has been studied for many years utilizing several techniques (Van Petten & Kutas, 1987; Small, Cottrell, & Tanenhaus, 1988; Li, Shu, Yip, Zhang, & Tang, 2001; Swaab, Brown, & Hagoort, 1998; Lucas, 1999). Most agree that there are a limited number of language processing subsystems: phonetic, phonological, lexical, syntactic, and conceptual (see Lucas, 1999 for an overview). Nevertheless, how these systems are related and organized is still under much debate. Two competing hypqtheses have emerged in the past thirty years with research from psychological, linguistic, and computational perspectives. The first proposes a modular view where language subsystems are encapsulated, operating independently of other cognitive systems (Fodor, 1983). Termed the exhaustive or multiple access hypothesis, it states that all meanings of an ambiguous word will be accessed momentarily following the occurrence of the word. Sentence context can then only help Context Effects 2 to select the appropriate meaning at a post-access stage. This hypothesis is based upon the premise that language processing is a modular, bottom-up method in which non­ lexical, sentential information does not penetrate lexical access (Fodor, 1983). In contrast, the context-dependent or selective access hypothesis declares that the contextually appropriate meaning of an ambiguous word can be selectively accessed early on if the preceding sentence context provides a strong bias to the appropriate meaning. This hypothesis assumes that language processing is operated by an interactive mechanism in which information can flow both bottom-up and top-down simultaneously and that lexical access and sentential context can mutually influence one another at a very early stage (McClelland, 1987). Higher order functioning can feedback upon the operation of lower subsystems (see Marslen-Wilson & Tyler, 1980 for complete discussion). In both multiple and selective access hypothesis, researchers believe that the time course of lexical ambiguity resolution reflects the general mechanisms of language understanding. Three models (the exhaustive access, selective access, and ordered access hypotheses) have emerged prominently from past research in lexical ambiguity. The following sections will give a detailed description of the types of ambiguity, the methods in which researchers gained data in this area, the models of language processing, and the theories from which these models have arisen. Types of ambiguity The two main types of lexical ambiguity are syntactic and semantic. Syntactic ambiguity refers to the ambiguity across category, as in the case of a noun versus a verb. Drill can either be the act performed by a carpenter or the object used to complete the Context Effects 3 task. Since these words may be found in different categories in the brain, some researchers believe that this type of ambiguity is easier to discern than semantic lexical ambiguity (Small, et al., 1988). There are two types of semantic ambiguity: polysemy and homonymy. A polysome is a word whose several meanings are related. For example, when we speak offoot we can refer to the appendage attached to your leg or the end of the bed where your feet rest. Both meanings are related but not literally the same. Homonymy refers to words whose definitions are unrelated as shown in the case of bat: "The boy picked up the bat and walked to home plate" or "As he walked into a cave a bat flew over his head." Both meanings are pronounced and spelled the same but they are semantically unrelated. The goal of the present research is to examine lexical access as it occurs across unrelated meanings, not categories. Therefore, this study focuses on the situations of semantic ambiguity. Research Methods It is important to examine the research methods utilized to explore lexical ambiguity because scientific history dictates that theory is wedded to methodology. To learn or improve upon theories results must either be duplicated or disputed. Research of language processing is no exception. Three methods are of primary interest to the current research. First, Grosjean (1980) conducted the pioneering work known as gating. This method uncovered the facility for persons to recognize a word when only half of the auditory information has been presented. It was a first look at the time course of word comprehension. Next, priming studies are of principal importance because one is able to present context followed by a target to examine participant's recognition and reaction. Most current theories of lexical ambiguity stem from this discourse. And finally, self- Context Effects 4 paced reading is a basic method to most closely duplicate a person's online reading time. Several examples of self-paced reading were analyzed by Just, Carpenter, and Woolley (1982) and the best was selected to display the contexts in the current study. The gating paradigm introduced by Grosjean (1980) has allowed for words to be presented piecemeal. Each word is presented repeatedly at increasing intervals until the entire word is heard. Grosjean's research had two main goals: study the on-line processing of spoken language and extend the current knowledge of the word recognition process (Cotton & Grosjean, 1984). During a test the subjects' task is to guess the stimulus being presented and report their level of confidence based on their answer. The main contribution of this research was the discovery that subjects are able to recognize a word in context with about only half of the acoustic information. This discovery leads one to realize the tremendous effect of context. This effect is the main concern of this thesis. Unfortunately, little work had been focused on the context of spoken sentence comprehension until Li (1996) conducted a study focused on this topic. Results, from Li (1996) suggest that speakers rely heavily upon semantic cues, which are consistent with previous untimed studies. Priming studies involve two main stimuli: prime and target. The prime is either a full sentence (Onifer & Swinney, 1981 and Simpson & Krueger, 1991) or a single word (Simpson, 1981 ). After presentation of these primes, the target is presented.
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